Portable chargers for auto batteries are available from Amazon.com, Sears and Walmart. Chargers are manufactured by brands such as DieHard, Black & Decker and Schumacher, and some models both charge and jump start vehicles.
Sears features portable battery chargers, such as the PDE ZipSpin, that are small enough to fit into pants pockets, while still powerful enough to jump start a vehicle. The retailer also carries larger chargers that have as much as 36 hours of power. Walmart sells several multipurpose chargers that also jump start cars and provide compressed air. Some of these models have safety features that warn users if the clamps are connected incorrectly when charging. Amazon.com carries portable auto battery chargers up to 109 volts, some which also charge mobile devices.